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Man Pages


Manual Reference Pages  - EDITLINE (3)

NAME

editline, el_init, el_end, el_reset, el_gets, el_getc, el_push, el_parse, el_set, el_get, el_source, el_resize, el_line, el_insertstr, el_deletestr, history_init, history_end, history, tok_init, tok_end, tok_reset, tok_line, tok_str - line editor, history and tokenization functions

CONTENTS

Library
Synopsis
Description
Line Editing Functions
History List Functions
Tokenization Functions
See Also
History
Authors
Bugs

LIBRARY


.Lb libedit

SYNOPSIS


.In histedit.h EditLine * el_init const char *prog FILE *fin FILE *fout FILE *ferr void el_end EditLine *e void el_reset EditLine *e const char * el_gets EditLine *e int *count int el_getc EditLine *e char *ch void el_push EditLine *e char *str int el_parse EditLine *e int argc const char *argv[] int el_set EditLine *e int op ... int el_get EditLine *e int op void *result int el_source EditLine *e const char *file void el_resize EditLine *e const LineInfo * el_line EditLine *e int el_insertstr EditLine *e const char *str void el_deletestr EditLine *e int count History * history_init void history_end History *h int history History *h HistEvent *ev int op ... Tokenizer * tok_init const char *IFS void tok_end Tokenizer *t void tok_reset Tokenizer *t int
.Fo tok_line Tokenizer *t const LineInfo *li int *argc const char **argv[] int *cursorc int *cursoro
.Fc int tok_str Tokenizer *t const char *str int *argc const char **argv[]

DESCRIPTION

The editline library provides generic line editing, history and tokenization functions, similar to those found in sh(1).

These functions are available in the libedit library (which needs the libtermcap library). Programs should be linked with -ledit -ltermcap .

LINE EDITING FUNCTIONS

The line editing functions use a common data structure, EditLine, which is created by el_init and freed by el_end.

The following functions are available:
el_init
  Initialise the line editor, and return a data structure to be used by all other line editing functions. prog is the name of the invoking program, used when reading the editrc(5) file to determine which settings to use. fin, fout and ferr are the input, output, and error streams (respectively) to use. In this documentation, references to "the tty" are actually to this input/output stream combination.
el_end
  Clean up and finish with e, assumed to have been created with el_init.
el_reset
  Reset the tty and the parser. This should be called after an error which may have upset the tty’s state.
el_gets
  Read a line from the tty. count is modified to contain the number of characters read. Returns the line read if successful, or NULL if no characters were read or if an error occurred.
el_getc
  Read a character from the tty. ch is modified to contain the character read. Returns the number of characters read if successful, -1 otherwise.
el_push
  Pushes str back onto the input stream. This is used by the macro expansion mechanism. Refer to the description of bind -s in editrc(5) for more information.
el_parse
  Parses the argv array (which is argc elements in size) to execute builtin editline commands. If the command is prefixed with "prog:" then el_parse will only execute the command if "prog" matches the prog argument supplied to el_init. The return value is -1 if the command is unknown, 0 if there was no error or "prog" did not match, or 1 if the command returned an error. Refer to editrc(5) for more information.
el_set
  Set editline parameters. op determines which parameter to set, and each operation has its own parameter list.

The following values for op are supported, along with the required argument list:

EL_PROMPT, char *(*f)(EditLine *)
  Define prompt printing function as f, which is to return a string that contains the prompt.
EL_RPROMPT, char *(*f)(EditLine *)
  Define right side prompt printing function as f, which is to return a string that contains the prompt.
EL_TERMINAL, const char *type
  Define terminal type of the tty to be type, or to TERM if type is NULL.
EL_EDITOR, const char *mode
  Set editing mode to mode, which must be one of "emacs" or "vi".
EL_SIGNAL, int flag
  If flag is non-zero, editline will install its own signal handler for the following signals when reading command input: SIGCONT, SIGHUP, SIGINT, SIGQUIT, SIGSTOP, SIGTERM, SIGTSTP, and SIGWINCH. Otherwise, the current signal handlers will be used.
EL_BIND, Xo
  const char *, ..., NULL
  Perform the bind builtin command. Refer to editrc(5) for more information.
EL_ECHOTC, Xo
  const char *, ..., NULL
  Perform the echotc builtin command. Refer to editrc(5) for more information.
EL_SETTC, Xo
  const char *, ..., NULL
  Perform the settc builtin command. Refer to editrc(5) for more information.
EL_SETTY, Xo
  const char *, ..., NULL
  Perform the setty builtin command. Refer to editrc(5) for more information.
EL_TELLTC, Xo
  const char *, ..., NULL
  Perform the telltc builtin command. Refer to editrc(5) for more information.
EL_ADDFN, Xo
  const char *name, const char *help, unsigned char (*func)(EditLine *e, int ch)
  Add a user defined function, func, referred to as name which is invoked when a key which is bound to name is entered. help is a description of name. At invocation time, ch is the key which caused the invocation. The return value of func should be one of:
CC_NORM Add a normal character.
CC_NEWLINE End of line was entered.
CC_EOF EOF was entered.
CC_ARGHACK Expecting further command input as arguments, do nothing visually.
CC_REFRESH Refresh display.
CC_REFRESH_BEEP
  Refresh display, and beep.
CC_CURSOR Cursor moved, so update and perform CC_REFRESH.
CC_REDISPLAY
  Redisplay entire input line. This is useful if a key binding outputs extra information.
CC_ERROR An error occurred. Beep, and flush tty.
CC_FATAL Fatal error, reset tty to known state.
EL_HIST, Xo History *(*func)(History *, int op, ...), const char *ptr
  Defines which history function to use, which is usually history. ptr should be the value returned by history_init.
EL_EDITMODE, int flag
  If flag is non-zero, editing is enabled (the default). Note that this is only an indication, and does not affect the operation of editline. At this time, it is the caller’s responsibility to check this (using el_get) to determine if editing should be enabled or not.
EL_GETCFN, int (*f)(EditLine *, char *c)
  Define the character reading function as f, which is to return the number of characters read and store them in c. This function is called internally by el_gets and el_getc. The builtin function can be set or restored with the special function name EL_BUILTIN_GETCFN.
EL_CLIENTDATA, void *data
  Register data to be associated with this EditLine structure. It can be retrieved with the corresponding el_get call.
el_get Get editline parameters. op determines which parameter to retrieve into result. Returns 0 if successful, -1 otherwise.

The following values for op are supported, along with actual type of result:

EL_PROMPT, char *(*f)(EditLine *)
  Return a pointer to the function that displays the prompt.
EL_RPROMPT, char *(*f)(EditLine *)
  Return a pointer to the function that displays the rightside prompt.
EL_EDITOR, const char *
  Return the name of the editor, which will be one of "emacs" or "vi".
EL_SIGNAL, int *
  Return non-zero if editline has installed private signal handlers (see el_get above).
EL_EDITMODE, int *
  Return non-zero if editing is enabled.
EL_GETCFN, int (**f)(EditLine *, char *)
  Return a pointer to the function that read characters, which is equal to EL_BUILTIN_GETCFN in the case of the default builtin function.
EL_CLIENTDATA, void **data
  Retrieve data previously registered with the corresponding el_set call.
EL_UNBUFFERED, int
  Sets or clears unbuffered mode. In this mode, el_gets will return immediately after processing a single character.
EL_PREP_TERM, int
  Sets or clears terminal editing mode.
el_source
  Initialise editline by reading the contents of file. el_parse is called for each line in file. If file is NULL, try $PWD/.editrc then $HOME/.editrc. Refer to editrc(5) for details on the format of file.
el_resize
  Must be called if the terminal size changes. If EL_SIGNAL has been set with el_set, then this is done automatically. Otherwise, it is the responsibility of the application to call el_resize on the appropriate occasions.
el_line
  Return the editing information for the current line in a LineInfo structure, which is defined as follows:
typedef struct lineinfo {
    const char *buffer;    /* address of buffer */
    const char *cursor;    /* address of cursor */
    const char *lastchar;  /* address of last character */
} LineInfo;

buffer is not NUL terminated. This function may be called after el_gets to obtain the LineInfo structure pertaining to line returned by that function, and from within user defined functions added with EL_ADDFN.

el_insertstr
  Insert str into the line at the cursor. Returns -1 if str is empty or will not fit, and 0 otherwise.
el_deletestr
  Delete num characters before the cursor.

HISTORY LIST FUNCTIONS

The history functions use a common data structure, History, which is created by history_init and freed by history_end.

The following functions are available:
history_init
  Initialise the history list, and return a data structure to be used by all other history list functions.
history_end
  Clean up and finish with h, assumed to have been created with history_init.
history
  Perform operation op on the history list, with optional arguments as needed by the operation. ev is changed accordingly to operation. The following values for op are supported, along with the required argument list:
H_SETSIZE, int size
  Set size of history to size elements.
H_GETSIZE
  Get number of events currently in history.
H_END Cleans up and finishes with h, assumed to be created with history_init.
H_CLEAR
  Clear the history.
H_FUNC, Xo
  void *ptr, history_gfun_t first, history_gfun_t next, history_gfun_t last, history_gfun_t prev, history_gfun_t curr, history_sfun_t set, history_vfun_t clear, history_efun_t enter, history_efun_t add
  Define functions to perform various history operations. ptr is the argument given to a function when it is invoked.
H_FIRST
  Return the first element in the history.
H_LAST
  Return the last element in the history.
H_PREV
  Return the previous element in the history.
H_NEXT
  Return the next element in the history.
H_CURR
  Return the current element in the history.
H_SET Set the cursor to point to the requested element.
H_ADD, const char *str
  Append str to the current element of the history, or perform the H_ENTER operation with argument str if there is no current element.
H_APPEND, const char *str
  Append str to the last new element of the history.
H_ENTER, const char *str
  Add str as a new element to the history, and, if necessary, removing the oldest entry to keep the list to the created size. If H_SETUNIQUE was has been called with a non-zero arguments, the element will not be entered into the history if its contents match the ones of the current history element. If the element is entered history returns 1, if it is ignored as a duplicate returns 0. Finally history returns -1 if an error occurred.
H_PREV_STR, const char *str
  Return the closest previous event that starts with str.
H_NEXT_STR, const char *str
  Return the closest next event that starts with str.
H_PREV_EVENT, int e
  Return the previous event numbered e.
H_NEXT_EVENT, int e
  Return the next event numbered e.
H_LOAD, const char *file
  Load the history list stored in file.
H_SAVE, const char *file
  Save the history list to file.
H_SETUNIQUE, int unique
  Set flag that adjacent identical event strings should not be entered into the history.
H_GETUNIQUE
  Retrieve the current setting if adjacent identical elements should be entered into the history.
H_DEL, int num
  Delete the event numbered e. This function is only provided for readline(3) compatibility. The caller is responsible for free’ing the string in the returned HistEvent.

The history function returns Ge] 0 if the operation op succeeds. Otherwise, -1 is returned and ev is updated to contain more details about the error.

TOKENIZATION FUNCTIONS

The tokenization functions use a common data structure, Tokenizer, which is created by tok_init and freed by tok_end.

The following functions are available:
tok_init
  Initialise the tokenizer, and return a data structure to be used by all other tokenizer functions. IFS contains the Input Field Separators, which defaults to <space>, <tab>, and <newline> if NULL.
tok_end
  Clean up and finish with t, assumed to have been created with tok_init.
tok_reset
  Reset the tokenizer state. Use after a line has been successfully tokenized by tok_line or tok_str and before a new line is to be tokenized.
tok_line
  Tokenize li, If successful, modify: argv to contain the words, argc to contain the number of words, cursorc (if not NULL) to contain the index of the word containing the cursor, and cursoro (if not NULL) to contain the offset within argv[cursorc] of the cursor.

Returns 0 if successful, -1 for an internal error, 1 for an unmatched single quote, 2 for an unmatched double quote, and 3 for a backslash quoted <newline>. A positive exit code indicates that another line should be read and tokenization attempted again.

tok_str
  A simpler form of tok_line; str is a NUL terminated string to tokenize.

SEE ALSO

sh(1), signal(3), termcap(3), editrc(5)

HISTORY

The editline library first appeared in BSD 4.4 . CC_REDISPLAY appeared in
.Nx 1.3 . CC_REFRESH_BEEP and EL_EDITMODE appeared in
.Nx 1.4 . EL_RPROMPT appeared in
.Nx 1.5 .

AUTHORS


.An -nosplit The editline library was written by
.An Christos Zoulas .
.An Luke Mewburn wrote this manual and implemented CC_REDISPLAY, CC_REFRESH_BEEP, EL_EDITMODE, and EL_RPROMPT.

BUGS

At this time, it is the responsibility of the caller to check the result of the EL_EDITMODE operation of el_get (after an el_source or el_parse) to determine if editline should be used for further input. I.e., EL_EDITMODE is purely an indication of the result of the most recent editrc(5) edit command.
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October 4, 2005 EDITLINE (3)

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